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jasperware, type of fine-grained, unglazed stoneware introduced by the English potter Josiah Wedgwood in 1775 as the result of a long series of experiments aimed at discovering the techniques of porcelain manufacture. Its name derives from the fact that it resembles the natural stone jasper in its hardness. Jasper is white in its natural state and is stained with metallic oxide colouring agents. The most common shade is pale blue, but dark blue, lilac, sage...